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EP1818616B1 - Turbomachine combustion chamber with tangential slots - Google Patents

Turbomachine combustion chamber with tangential slots Download PDF

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Publication number
EP1818616B1
EP1818616B1 EP07101654A EP07101654A EP1818616B1 EP 1818616 B1 EP1818616 B1 EP 1818616B1 EP 07101654 A EP07101654 A EP 07101654A EP 07101654 A EP07101654 A EP 07101654A EP 1818616 B1 EP1818616 B1 EP 1818616B1
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EP
European Patent Office
Prior art keywords
combustion chamber
chamber
chamber bottom
flange
fairing
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Active
Application number
EP07101654A
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German (de)
French (fr)
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EP1818616A1 (en
Inventor
Florian Bessagnet
Mario De Sousa
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Safran Aircraft Engines SAS
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SNECMA SAS
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Publication of EP1818616A1 publication Critical patent/EP1818616A1/en
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Publication of EP1818616B1 publication Critical patent/EP1818616B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/283—Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
    • F23R3/60—Support structures; Attaching or mounting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/00005—Preventing fatigue failures or reducing mechanical stress in gas turbine components

Definitions

  • the present invention relates to the general field of turbomachine annular combustion chambers provided with a one-piece fairing protection of fuel injection systems.
  • An annular turbomachine combustion chamber is generally formed of two longitudinal walls of revolution (an outer wall and an inner wall) which are connected upstream by a transverse wall forming a chamber bottom.
  • the present invention relates more particularly to combustion chambers which also comprise a monobloc fairing mounted upstream of the chamber bottom.
  • the fairing allows in particular to protect the fuel injection systems that are mounted on the chamber floor.
  • the assembly of these different elements of the combustion chamber is performed by means of bolting mounted at the inner and outer walls.
  • the chamber base and the fairing each comprise an internal flange and an external flange on which are fixed by bolting respectively the inner wall and the outer wall of the combustion chamber, these longitudinal walls being interposed between the fairing and the bedroom floor.
  • this type of combustion chamber architecture poses many problems.
  • the various elements of the combustion chamber have significant manufacturing tolerances, which leads to a stack of tolerances resulting in poor docking between these elements during assembly of the combustion chamber, which causes a loss in clamping passing between the flanges.
  • the part of the clamping which is used to deform the chamber is subtracted from the reaction force between its components. When this reaction force decreases, the effort required to slide the pieces together is therefore less.
  • An extra tightening torque is therefore necessary to make up for the games coming from manufacturing tolerances of the components and thus keep the proper tightening force for the passage of sliding forces passing through the connection. Therefore, in operation, the vibrations caused by the combustion of the gases inside the combustion chamber often cause the formation of cracks in the bolting on the shroud and / or the chamber bottom. Such cracks are particularly detrimental to the life of the combustion chamber.
  • the main object of the present invention is therefore to overcome such disadvantages by proposing an annular combustion chamber architecture which is easy to mount and has sufficient flexibility to prevent the formation of cracks while maintaining a useful clamping efficiency.
  • annular turbomachine combustion chamber comprising longitudinal walls connected by a transverse chamber bottom and a one-piece fairing, the chamber bottom and the fairing each comprising an inner flange and an outer flange each pierced by a flange.
  • a plurality of holes for the passage of fastening systems for fastening the shroud to the chamber bottom characterized in that, at each fastening system, is associated at least one slot tangential to the annular geometry of the chamber formed on the corresponding flange of the chamber bottom and / or on the corresponding flange of the fairing, each slot being formed in the immediate vicinity of the corresponding fastening system.
  • the invention also relates to a turbomachine comprising an annular combustion chamber as defined above.
  • FIGS. 1 to 3 illustrate a combustion chamber for a turbomachine according to the invention.
  • Such a turbomachine for example aeronautical, comprises in particular a compression section (not shown) in which air is compressed before being injected into a chamber housing 2, then into a combustion chamber 4 mounted inside. of it.
  • Compressed air is introduced into the combustion chamber and mixed with fuel before being burned.
  • the gases resulting from this combustion are then directed to a high-pressure turbine 5 disposed at the outlet of the combustion chamber.
  • the combustion chamber 4 is of annular type. It is formed of an inner annular wall 6 and an outer annular wall 8 which extend in a substantially longitudinal direction relative to the longitudinal axis X-X of the turbomachine.
  • the combustion chamber also comprises a one-piece fairing 12 (that is to say made in one and the same piece) covering the chamber bottom 10.
  • the main components of the combustion chamber i.e. the longitudinal walls 6, 8, the chamber bottom 10 and the fairing 12 are assembled together by means of a plurality of fixing systems 14 regularly distributed over the entire circumference of the combustion chamber and each formed of a screw 14a and a clamping nut 14b.
  • the chamber bottom 10 has an internal flange 16 and an outer flange 18 extending longitudinally upstream and each provided with holes, 16a and 18a, respectively, for the passage of fastening screws 14a.
  • the one-piece fairing 12 comprises an inner flange 20 and an outer flange 22 which extend longitudinally downstream and which are each provided with holes, 20a and 22a, respectively, for the passage of the fastening screws 14a.
  • the longitudinal walls 6, 8 of the combustion chamber are also drilled at their upstream end of a plurality of holes, respectively 6a and 8a, for the passage of the fixing screws 14a.
  • the chamber bottom 10 and the fairing 12 of the combustion chamber are each provided with a plurality of openings, respectively 24 and 26, for the passage of fuel injection systems 28.
  • each fastening system 14 is associated with at least one tangential slot 30 formed on the corresponding flange 16, 18 of the chamber bottom 10 and / or on the corresponding flange 20, 22 of the fairing 12, each tangential slot. being formed in the immediate vicinity of the corresponding fastening system.
  • Tangential slot means a slot that extends in a substantially tangential (or circumferential) direction relative to the annular general geometry of the combustion chamber.
  • a tangential slot makes it possible to reduce the constraints tangential at each fastening system and thus reduce the risk of formation of cracks.
  • both the inner flange 16 of the chamber bottom and the inner flange 20 of the fairing 12 are provided with a tangential slot 30 formed in the immediate vicinity of the fastening system.
  • the outer flange 18 of the chamber bottom and the outer flange 22 of the shroud 12 are each provided with a tangential slot 30 arranged in the immediate vicinity of the fastening system.
  • the tangential slots 30 are formed in the immediate vicinity of the fastening systems 14, that is to say that they are not intended to be arranged between two adjacent fastening systems for example. Indeed, the presence of these slots makes it possible to provide flexibility in the fastening systems which are at the origin of too great rigidity of the assembly of the components of the combustion chamber. It should also be noted that the longitudinal walls 6, 8 of the combustion chamber are devoid of such tangential slots, which eliminates any risk of leakage and lack of rigidity of these walls.
  • the slots 30 extend tangentially over a distance which is substantially the same on either side of the fixing systems 14.
  • they may have a length (measured tangentially) of approximately ⁇ (3.14) times the assembly diameter divided by 2 times the number of slots (the grooved length is equal to the ungrooved length).
  • each slot dimension and shape
  • the slots are for example obtained by water jet drilling or wire cutting, these operations being controlled by a numerical control.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Details Of Aerials (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Arrière-plan de l'inventionBackground of the invention

La présente invention se rapporte au domaine général des chambres de combustion annulaires pour turbomachine munies d'un carénage monobloc de protection des systèmes d'injection de carburant.The present invention relates to the general field of turbomachine annular combustion chambers provided with a one-piece fairing protection of fuel injection systems.

Une chambre de combustion annulaire de turbomachine est généralement formée de deux parois longitudinales de révolution (une paroi externe et une paroi interne) qui sont reliées en amont par une paroi transversale formant fond de chambre.An annular turbomachine combustion chamber is generally formed of two longitudinal walls of revolution (an outer wall and an inner wall) which are connected upstream by a transverse wall forming a chamber bottom.

La présente invention vise plus particulièrement les chambres de combustion qui comportent également un carénage monobloc monté en amont du fond de chambre. Le carénage permet notamment de protéger les systèmes d'injection de carburant qui sont montés sur le fond de chambre.The present invention relates more particularly to combustion chambers which also comprise a monobloc fairing mounted upstream of the chamber bottom. The fairing allows in particular to protect the fuel injection systems that are mounted on the chamber floor.

Un tel agencement est décrit par le document US 6 779 268 B .Such an arrangement is described by the document US 6,779,268 B .

L'assemblage de ces différents éléments de la chambre de combustion s'effectue au moyen de boulonnages montés au niveau des parois interne et externe. De façon plus précise, le fond de chambre et le carénage comportent chacun une bride interne et une bride externe sur lesquelles sont fixées par boulonnage respectivement la paroi interne et la paroi externe de la chambre de combustion, ces parois longitudinales étant intercalées entre le carénage et le fond de chambre. Ainsi, un même boulonnage traverse à la fois l'une des parois longitudinales, le fond de chambre et le carénage de la chambre de combustion.The assembly of these different elements of the combustion chamber is performed by means of bolting mounted at the inner and outer walls. More specifically, the chamber base and the fairing each comprise an internal flange and an external flange on which are fixed by bolting respectively the inner wall and the outer wall of the combustion chamber, these longitudinal walls being interposed between the fairing and the bedroom floor. Thus, the same bolting through both one of the longitudinal walls, the chamber bottom and the fairing of the combustion chamber.

En pratique, ce type d'architecture de chambre de combustion pose de nombreux problèmes. Notamment, les différents éléments de la chambre de combustion ont des tolérances de fabrication importantes, ce qui conduit à un empilage des tolérances ayant pour conséquence un mauvais accostage entre ces éléments lors du montage de la chambre de combustion, ce qui engendre une perte au niveau du serrage transitant entre les brides. En effet, la part du serrage qui est utilisée pour déformer la chambre est soustraite de l'effort de réactions entre ses composants. Lorsque cet effort de réaction diminue, l'effort nécessaire pour faire glisser les pièces entre elles est donc moindre. Un couple de serrage supplémentaire est donc nécessaire pour rattraper les jeux provenant des tolérances de fabrication des composants et ainsi garder le bon effort de serrage pour le passage des efforts de glissement transitant dans la liaison. De ce fait, en fonctionnement, les vibrations causées par la combustion des gaz à l'intérieur de la chambre de combustion entraînent souvent la formation de criques au niveau des boulonnages sur le carénage et/ou le fond de chambre. De telles criques sont particulièrement préjudiciables à la durée de vie de la chambre de combustion.In practice, this type of combustion chamber architecture poses many problems. In particular, the various elements of the combustion chamber have significant manufacturing tolerances, which leads to a stack of tolerances resulting in poor docking between these elements during assembly of the combustion chamber, which causes a loss in clamping passing between the flanges. Indeed, the part of the clamping which is used to deform the chamber is subtracted from the reaction force between its components. When this reaction force decreases, the effort required to slide the pieces together is therefore less. An extra tightening torque is therefore necessary to make up for the games coming from manufacturing tolerances of the components and thus keep the proper tightening force for the passage of sliding forces passing through the connection. Therefore, in operation, the vibrations caused by the combustion of the gases inside the combustion chamber often cause the formation of cracks in the bolting on the shroud and / or the chamber bottom. Such cracks are particularly detrimental to the life of the combustion chamber.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention a donc pour but principal de pallier de tels inconvénients en proposant une architecture de chambre de combustion annulaire de montage facilité et ayant une souplesse suffisante pour éviter la formation de criques tout en gardant une efficacité de serrage utile.The main object of the present invention is therefore to overcome such disadvantages by proposing an annular combustion chamber architecture which is easy to mount and has sufficient flexibility to prevent the formation of cracks while maintaining a useful clamping efficiency.

A cet effet, il est prévu une chambre de combustion annulaire de turbomachine, comportant des parois longitudinales reliées par un fond de chambre transversal et un carénage monobloc, le fond de chambre et le carénage comprenant chacun une bride interne et une bride externe percées chacune d'une pluralité de trous pour le passage de systèmes de fixation pour la fixation du carénage sur le fond de chambre, caractérisée en ce que, à chaque système de fixation, est associée au moins une fente tangentielle par rapport à la géométrie annulaire de la chambre de combution formée sur la bride correspondante du fond de chambre et/ou sur la bride correspondante du carénage, chaque fente étant formée au voisinage immédiat du système de fixation correspondant.For this purpose, there is provided an annular turbomachine combustion chamber, comprising longitudinal walls connected by a transverse chamber bottom and a one-piece fairing, the chamber bottom and the fairing each comprising an inner flange and an outer flange each pierced by a flange. a plurality of holes for the passage of fastening systems for fastening the shroud to the chamber bottom, characterized in that, at each fastening system, is associated at least one slot tangential to the annular geometry of the chamber formed on the corresponding flange of the chamber bottom and / or on the corresponding flange of the fairing, each slot being formed in the immediate vicinity of the corresponding fastening system.

La présence d'au moins une fente tangentielle au niveau de chaque système de fixation permet, d'une part, d'augmenter la souplesse d'accostage entre les trois composants principaux de la chambre de combustion assurant ainsi un meilleur serrage entre ces composants, et, d'autre part, de réduire les contraintes mécaniques au niveau des systèmes de fixation. De ce fait, le couple de serrage total sera diminué pour se rapprocher de celui utile uniquement au passage des efforts en service. Le montage de la chambre de combustion s'en trouve facilité et sa durée de vie en service augmentée.The presence of at least one tangential slot at each fastening system makes it possible, on the one hand, to increase the mooring flexibility between the three main components of the combustion chamber thus ensuring better clamping between these components, and, on the other hand, to reduce the mechanical stresses in the fastening systems. Therefore, the total tightening torque will be decreased to approach that useful only to the passage of efforts in service. The assembly of the combustion chamber is facilitated and its service life increased.

L'invention a également pour objet une turbomachine comportant une chambre de combustion annulaire telle que définie précédemment.The invention also relates to a turbomachine comprising an annular combustion chamber as defined above.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-dessous, en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif. Sur les figures :

  • la figure 1 est une vue en coupe longitudinale d'une chambre de combustion de turbomachine selon l'invention ;
  • la figure 2 est une vue partielle et en perspective de la chambre de combustion de la figure 1 avant son assemblage ; et
  • la figure 3 est une vue partielle et en perspective de la chambre de combustion de la figure 2 après son assemblage.
Other features and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate an embodiment having no limiting character. In the figures:
  • the figure 1 is a longitudinal sectional view of a turbomachine combustion chamber according to the invention;
  • the figure 2 is a partial view in perspective of the combustion chamber of the figure 1 before assembly; and
  • the figure 3 is a partial view in perspective of the combustion chamber of the figure 2 after assembly.

Description détaillée d'un mode de réalisationDetailed description of an embodiment

Les figures 1 à 3 illustrent une chambre de combustion pour turbomachine selon l'invention.The Figures 1 to 3 illustrate a combustion chamber for a turbomachine according to the invention.

Une telle turbomachine, par exemple aéronautique, comporte notamment une section de compression (non représentée) dans laquelle de l'air est comprimé avant d'être injecté dans un carter de chambre 2, puis dans une chambre de combustion 4 montée à l'intérieur de celui-ci.Such a turbomachine, for example aeronautical, comprises in particular a compression section (not shown) in which air is compressed before being injected into a chamber housing 2, then into a combustion chamber 4 mounted inside. of it.

L'air comprimé est introduit dans la chambre de combustion et mélangé à du carburant avant d'y être brûlé. Les gaz issus de cette combustion sont alors dirigés vers une turbine haute-pression 5 disposée en sortie de la chambre de combustion.Compressed air is introduced into the combustion chamber and mixed with fuel before being burned. The gases resulting from this combustion are then directed to a high-pressure turbine 5 disposed at the outlet of the combustion chamber.

La chambre de combustion 4 est de type annulaire. Elle est formée d'une paroi annulaire interne 6 et d'une paroi annulaire externe 8 qui s'étendent selon une direction sensiblement longitudinale par rapport à l'axe longitudinal X-X de la turbomachine.The combustion chamber 4 is of annular type. It is formed of an inner annular wall 6 and an outer annular wall 8 which extend in a substantially longitudinal direction relative to the longitudinal axis X-X of the turbomachine.

Ces parois longitudinales 6, 8 sont réunies en amont (par rapport au sens d'écoulement des gaz de combustion dans la chambre de combustion) par une paroi transversale 10 formant fond de chambre. La chambre de combustion comporte également un carénage monobloc 12 (c'est-à-dire réalisé en une seule et même pièce) couvrant le fond de chambre 10.These longitudinal walls 6, 8 are joined upstream (with respect to the direction of flow of the combustion gases in the combustion chamber) by a transverse wall 10 forming a chamber bottom. The combustion chamber also comprises a one-piece fairing 12 (that is to say made in one and the same piece) covering the chamber bottom 10.

Les composants principaux de la chambre de combustion (à savoir ; les parois longitudinales 6, 8, le fond de chambre 10 et le carénage 12) sont assemblés entre eux à l'aide d'une pluralité de systèmes de fixation 14 régulièrement répartis sur toute la circonférence de la chambre de combustion et formés chacun d'une vis 14a et d'un écrou de serrage 14b.The main components of the combustion chamber (i.e. the longitudinal walls 6, 8, the chamber bottom 10 and the fairing 12) are assembled together by means of a plurality of fixing systems 14 regularly distributed over the entire circumference of the combustion chamber and each formed of a screw 14a and a clamping nut 14b.

De façon plus précise, comme illustré sur les figures 2 et 3, le fond de chambre 10 comporte une bride interne 16 et une bride externe 18 s'étendant longitudinalement vers l'amont et munie chacune de trous, respectivement 16a et 18a, pour le passage de vis de fixation 14a.More precisely, as illustrated in the figures 2 and 3 , the chamber bottom 10 has an internal flange 16 and an outer flange 18 extending longitudinally upstream and each provided with holes, 16a and 18a, respectively, for the passage of fastening screws 14a.

De même, le carénage monobloc 12 comprend une bride interne 20 et une bride externe 22 qui s'étendent longitudinalement vers l'aval et qui sont chacune munie de trous, respectivement 20a et 22a, pour le passage des vis de fixation 14a.Similarly, the one-piece fairing 12 comprises an inner flange 20 and an outer flange 22 which extend longitudinally downstream and which are each provided with holes, 20a and 22a, respectively, for the passage of the fastening screws 14a.

Quant aux parois longitudinales 6, 8 de la chambre de combustion, elles sont également percées à leur extrémité amont d'une pluralité de trous, respectivement 6a et 8a, pour le passage des vis de fixation 14a.As for the longitudinal walls 6, 8 of the combustion chamber, they are also drilled at their upstream end of a plurality of holes, respectively 6a and 8a, for the passage of the fixing screws 14a.

L'assemblage de ces composants de la chambre de combustion s'effectue en intercalant les parois longitudinales 6, 8 entre les brides respectives du fond de chambre 10 et du carénage 12 comme représenté sur les figures 1 et 3. L'ensemble est alors maintenu par les vis de fixation 14a sur lesquelles sont serrées les écrous 14b, ces derniers pouvant éventuellement être soudés sur le fond de chambre 10.The assembly of these components of the combustion chamber is performed by interposing the longitudinal walls 6, 8 between the respective flanges of the chamber bottom 10 and the shroud 12 as shown in the drawings. figures 1 and 3 . The assembly is then held by the fixing screws 14a on which are tightened the nuts 14b, the latter possibly being welded to the chamber bottom 10.

Par ailleurs, le fond de chambre 10 et le carénage 12 de la chambre de combustion sont chacun pourvus d'une pluralité d'ouvertures, respectivement 24 et 26, pour le passage de systèmes d'injection de carburant 28.Furthermore, the chamber bottom 10 and the fairing 12 of the combustion chamber are each provided with a plurality of openings, respectively 24 and 26, for the passage of fuel injection systems 28.

Selon l'invention, à chaque système de fixation 14, est associée au moins une fente tangentielle 30 formée sur la bride correspondante 16, 18 du fond de chambre 10 et/ou sur la bride correspondante 20, 22 du carénage 12, chaque fente tangentielle étant formée au voisinage immédiat du système de fixation correspondant.According to the invention, each fastening system 14 is associated with at least one tangential slot 30 formed on the corresponding flange 16, 18 of the chamber bottom 10 and / or on the corresponding flange 20, 22 of the fairing 12, each tangential slot. being formed in the immediate vicinity of the corresponding fastening system.

Par fente tangentielle, il faut entendre une fente qui s'étend selon une direction sensiblement tangentielle (ou circonférentielle) par rapport à la géométrie générale annulaire de la chambre de combustion. Une fente tangentielle permet en effet de réduire les contraintes tangentielles au niveau de chaque système de fixation et ainsi de réduire les risques de formation de criques.Tangential slot means a slot that extends in a substantially tangential (or circumferential) direction relative to the annular general geometry of the combustion chamber. A tangential slot makes it possible to reduce the constraints tangential at each fastening system and thus reduce the risk of formation of cracks.

Dans l'exemple de réalisation illustré par les figures 1 à 3, si l'on considère l'un des systèmes de fixation 14 destiné au montage de la paroi longitudinale interne 6 sur le fond de chambre 10, à la fois la bride interne 16 du fond de chambre et la bride interne 20 du carénage 12 sont munies d'une fente tangentielle 30 formée au voisinage immédiat du système de fixation.In the exemplary embodiment illustrated by the Figures 1 to 3 , considering one of the fastening systems 14 for mounting the inner longitudinal wall 6 on the chamber bottom 10, both the inner flange 16 of the chamber bottom and the inner flange 20 of the fairing 12 are provided with a tangential slot 30 formed in the immediate vicinity of the fastening system.

De même, en considérant l'un des systèmes de fixation 14 destiné au montage de la paroi longitudinale externe 8 sur le fond de chambre 10, la bride externe 18 du fond de chambre et la bride externe 22 du carénage 12 sont chacune munies d'une fente tangentielle 30 aménagée au voisinage immédiat du système de fixation.Similarly, considering one of the fastening systems 14 for mounting the outer longitudinal wall 8 on the chamber bottom 10, the outer flange 18 of the chamber bottom and the outer flange 22 of the shroud 12 are each provided with a tangential slot 30 arranged in the immediate vicinity of the fastening system.

Alternativement, pour chaque système de fixation, seule l'une des brides correspondantes du fond de chambre et du carénage pourraient être munies d'une telle fente tangentielle.Alternatively, for each fastening system, only one of the corresponding flanges of the chamber bottom and the fairing could be provided with such a tangential slot.

Les fentes tangentielles 30 sont formées au voisinage immédiat des systèmes de fixation 14, c'est-à-dire qu'elles ne sont pas destinées à être disposées entre deux systèmes de fixation adjacents par exemple. En effet, la présence de ces fentes permet d'apporter une souplesse au niveau des systèmes de fixation qui sont à l'origine d'une trop grande rigidité de l'assemblage des composants de la chambre de combustion. On notera également que les parois longitudinales 6, 8 de la chambre de combustion sont dépourvues de telle fentes tangentielles ce qui élimine tous risques de défaut d'étanchéité et de manque de rigidité de ces parois.The tangential slots 30 are formed in the immediate vicinity of the fastening systems 14, that is to say that they are not intended to be arranged between two adjacent fastening systems for example. Indeed, the presence of these slots makes it possible to provide flexibility in the fastening systems which are at the origin of too great rigidity of the assembly of the components of the combustion chamber. It should also be noted that the longitudinal walls 6, 8 of the combustion chamber are devoid of such tangential slots, which eliminates any risk of leakage and lack of rigidity of these walls.

Sur l'exemple de réalisation des figures 1 à 3, les fentes 30 s'étendent tangentiellement sur une distance qui est sensiblement la même de part et d'autre des systèmes de fixation 14. A titre informatif, elles peuvent avoir une longueur (mesurée tangentiellement) d'environ Π (3,14) fois le diamètre d'assemblage divisé par 2 fois le nombre de fentes (la longueur rainurée est égale à la longueur non rainurée).On the example of realization of the Figures 1 to 3 , the slots 30 extend tangentially over a distance which is substantially the same on either side of the fixing systems 14. For information, they may have a length (measured tangentially) of approximately Π (3.14) times the assembly diameter divided by 2 times the number of slots (the grooved length is equal to the ungrooved length).

Les paramètres géométriques de chaque fente (dimensions et forme) sont définis selon le degré de souplesse que l'on souhaite introduire lors de l'assemblage de la chambre de combustion. Les fentes sont par exemple obtenues par un perçage au jet d'eau ou par découpe au fil, ces opérations étant pilotées par une commande numérique.The geometric parameters of each slot (dimensions and shape) are defined according to the degree of flexibility that it is desired to introduce during the assembly of the combustion chamber. The slots are for example obtained by water jet drilling or wire cutting, these operations being controlled by a numerical control.

Claims (2)

  1. Turbine engine annular combustion chamber, comprising longitudinal walls (6, 8) connected by a transverse chamber bottom (10) and a single-piece cowling (12), the chamber bottom (10) and the cowling (12) each comprising an inner flange (16, 20) and an outer flange (18, 22) each with a plurality of holes (16a to 22a) made in it for the passage of fixing systems (14) for fixing the cowling on the chamber bottom, characterised in that each fixing system (14) has associated with it at least one tangential slot (30) relative to the annular geometry of the combustion chamber formed on the corresponding flange (16, 18) of the chamber bottom (10) and/or on the corresponding flange (20, 22), of the cowling (12), each slot (30) being formed in the immediate vicinity of the corresponding fixing system (14).
  2. Turbine engine, characterised in that it comprises an annular combustion chamber (4) according to Claim 1.
EP07101654A 2006-02-08 2007-02-02 Turbomachine combustion chamber with tangential slots Active EP1818616B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0650447A FR2897144B1 (en) 2006-02-08 2006-02-08 COMBUSTION CHAMBER FOR TURBOMACHINE WITH TANGENTIAL SLOTS

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EP1818616A1 EP1818616A1 (en) 2007-08-15
EP1818616B1 true EP1818616B1 (en) 2012-12-26

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US (1) US7673457B2 (en)
EP (1) EP1818616B1 (en)
CN (1) CN101017000A (en)
CA (1) CA2577527C (en)
FR (1) FR2897144B1 (en)
RU (1) RU2422730C2 (en)

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Also Published As

Publication number Publication date
EP1818616A1 (en) 2007-08-15
RU2007104723A (en) 2008-08-20
RU2422730C2 (en) 2011-06-27
FR2897144B1 (en) 2008-05-02
CA2577527A1 (en) 2007-08-08
US20080010997A1 (en) 2008-01-17
FR2897144A1 (en) 2007-08-10
CN101017000A (en) 2007-08-15
CA2577527C (en) 2014-09-30
US7673457B2 (en) 2010-03-09

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